Keryx

@cryptoduke01·duke.sol·25 followers·added 2026-07-19

Keryx is a paid tool registry for AI agents — a toll booth for the agent economy. Developers publish HTTP tools at a price, and agents discover them, pay per call in USDC on Arc, and get results in one round trip. The Next.js app serves the whole flow: POST src/app/api/call answers with an x402 402 challenge, accepts an EIP-3009 USDC authorization, and settles through src/lib/x402/local-facilitator.ts, with receipts checked on-chain via src/app/api/receipt/verify. A Foundry contract at contracts/src/KeryxRegistry.sol backs the registry with tests and a deploy script. The @keryxhq/middleware package in packages/keryx-middleware turns any HTTP handler into a paid tool, and src/app/api/mcp exposes MCP discovery for agent clients.